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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.0926
         Microsoft Security Bulletin MS16-046: Security Update for
                         Secondary Logon (3148538)
                               13 April 2016

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Microsoft Windows
Publisher:         Microsoft
Operating System:  Windows 10
Impact/Access:     Administrator Compromise -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-0135  

Original Bulletin: 
   https://technet.microsoft.com/en-us/library/security/MS16-046

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Microsoft Security Bulletin MS16-046: Security Update for Secondary Logon 
(3148538)

Bulletin Number: MS16-046

Bulletin Title: Security Update for Secondary Logon

Severity: Important

KB Article: 3148538

Version: 1.0

Published Date: April 12, 2016

Executive Summary

This security update resolves a vulnerability in Microsoft Windows. An 
attacker who successfully exploited this vulnerability could run arbitrary 
code as an administrator.

This security update is rated Important for all supported editions of Windows
10. For more information, see the Affected Software section.

The security update addresses the vulnerability by correcting how Windows 
Secondary Logon Service handles requests in memory.

Affected Software

Windows 10 for 32-bit Systems [1]

Windows 10 for x64-based Systems [1]

Windows 10 for x64-based Systems [1]

Windows 10 Version 1511 for 32-bit Systems [1]

Windows 10 Version 1511 for x64-based Systems [1]

[1]Windows 10 updates are cumulative. The monthly security release includes 
all security fixes for vulnerabilities that affect Windows 10, in addition to
non-security updates. The updates are available via the Microsoft Update 
Catalog.


Vulnerability Information

Secondary Logon Elevation of Privilege Vulnerability - CVE-2016-0135

An elevation of privilege vulnerability exists in Microsoft Windows when the 
Windows Secondary Logon Service fails to properly manage requests in memory. 
An attacker who successfully exploited this vulnerability could run arbitrary
code as an administrator. An attacker could then install programs; view, 
change, or delete data; or create new accounts with full user rights.

To exploit this vulnerability, an attacker must first log on to the system. An
attacker could then run a specially crafted application that could exploit the
vulnerability and take control of an affected system. The security update 
addresses the vulnerability by correcting how the Windows Secondary Logon 
Service handles requests in memory.

The following table contains a link to the standard entry for each 
vulnerability in the Common Vulnerabilities and Exposures list:

Vulnerability Title                                  CVE number     Publicly disclosed   Exploited

Secondary Logon Elevation of Privilege Vulnerability CVE-2016-0135  Yes                  No

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